In a statement, Yankey said his decision is just the next step in his journey.
"I reached my decision following conversations with family and coaches, and am greatly looking forward to the next chapter in life," said Yankey. "The decision was not easy. I have loved my time at Stanford and am a proud member of Nerd Nation. I am humbled at the prospect of joining a long list of Stanford alumni currently playing in the NFL.Trent Murphy Shayne Skov Tyler Gaffney
"I want to thank everyone at Stanford for their unwavering support throughout my four years. Coming here was an incredible opportunity and everyone on campus - from professors and coaches to support staff and fans - have demonstrated why this place is so special."